The hydraulics of supercritical junction flow in a 45° junction manhole as applied in sewer systems are explored. Based on an experimental approach and previously collected evidence on supercritical flow in wastewater hydraulics, the main hydraulic features of this standard structure, with the manhole extension added, are determined. First, the governing wave system including waves A through D is described. Then, the various flow types are presented in a diagram relating to seven regimes. Further, the heights of waves B and C, as also the swell at the manhole end are specified, and the discharge capacities for flows in either one branch, or both branches are given. Finally, it is outlined that under otherwise equal conditions, the capacity of junction manholes is at least 20% larger than in the bend manhole. The present indications allow a direct application.
Supercritical junction flow in sewer manholes / DEL GIUDICE, Giuseppe; Hager, W. H.. - STAMPA. - 2:(2001), pp. 466-472. (Intervento presentato al convegno Proceedings of the XXIX IAHR Congress tenutosi a Beijing, China nel September 16–21).
Supercritical junction flow in sewer manholes
DEL GIUDICE, GIUSEPPE;
2001
Abstract
The hydraulics of supercritical junction flow in a 45° junction manhole as applied in sewer systems are explored. Based on an experimental approach and previously collected evidence on supercritical flow in wastewater hydraulics, the main hydraulic features of this standard structure, with the manhole extension added, are determined. First, the governing wave system including waves A through D is described. Then, the various flow types are presented in a diagram relating to seven regimes. Further, the heights of waves B and C, as also the swell at the manhole end are specified, and the discharge capacities for flows in either one branch, or both branches are given. Finally, it is outlined that under otherwise equal conditions, the capacity of junction manholes is at least 20% larger than in the bend manhole. The present indications allow a direct application.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
